std::atomic_flag_test_and_set

Jump to: navigation, search

Defined in header `<atomic>`

bool atomic_flag_test_and_set( volatile std::atomic_flag* p );	(1)	(since C++11)

bool atomic_flag_test_and_set( std::atomic_flag* p );	(2)	(since C++11)

bool atomic_flag_test_and_set_explicit( volatile std::atomic_flag* p, std::memory_order order );	(3)	(since C++11)

bool atomic_flag_test_and_set_explicit( std::atomic_flag* p, std::memory_order order );	(4)	(since C++11)

Atomically changes the state of a std::atomic_flag pointed to by p to set (true) and returns the value it held before.

First version
bool atomic_flag_test_and_set( volatile std::atomic_flag* p ) { return p->test_and_set(); }
Second version
bool atomic_flag_test_and_set( std::atomic_flag* p ) { return p->test_and_set(); }
Third version
bool atomic_flag_test_and_set_explicit( volatile std::atomic_flag* p, std::memory_order order ) { return p->test_and_set(order); }
Fourth version
bool atomic_flag_test_and_set_explicit( std::atomic_flag* p, std::memory_order order ) { return p->test_and_set(order); }


atomic_flag (C++11)	the lock-free boolean atomic type (class)

atomic_flag_clear atomic_flag_clear_explicit (C++11) (C++11)	atomically sets the value of the flag to false (function)

memory_order (C++11)	defines memory ordering constraints for the given atomic operation (typedef)

Contents

p	-	pointer to std::atomic_flag to access
order	-	the memory sycnhronization ordering for this operation